Monkey.D.Luffy - 500 Years In The Future (OP07)

Product Details:

Card No: OP07-091
Rarity: R
Color: Black
Card Type: Character
Cost: 5
Power: 6000
Counter: 1000
Attribute: Special
Type: Straw Hat Crew
Card Set: -500 Years in the Future- [OP-07]

Effect:
[When Attacking] Trash up to 1 of your opponent's Characters with a cost of 2 or less. Then, place any number of Character cards with a cost of 4 or more from your trash at the bottom of your deck in any order. This Character gains +1000 power during this turn for every 3 cards placed at the bottom of your deck.

Card Questions/Ruling:

• If I put 5 Character cards with a cost of 4 or more from my trash at the bottom of my deck according to this [When Attacking] effect, what happens to this Character's power?
  In this case, this Character's power becomes +1000 according to this [When Attacking] effect.